the 05-LHR-121 is a 2.5 mW tube - 632.8nm and the power supplu is a nice 2.4kV 5mA unit, with the tube casing and a complete uncut alden plug... Not a bad little laser, price is fair. It's a complete kit that only needs a 24vdc power supply, like a wall wart or a bench supply. And it's new.

The alden plug IIRC has the ballast resistor within it. You can power the laser with any 110v HeNe laser PS with the same/close output.(2400vdc @5.25A) and sell that one on ebay-- look at this: Melles Griot HeNe Gas Laser 05-LHP-121 w/ Power Supply - eBay (item 390111294415 end time Apr-25-10 16:46:03 PDT) for a comparison. Not that hard or expensive to come up with a 20-28 vdc 1.25A PS to power the PS-pita -but not much IMO. HeNe lasers are beautiful- I have that one(i think)--Hz btw --not all wallwarts are regulated and they rarely output exactly whats on the label - fyi.

The alden plug IIRC has the ballast resistor within it. You can power the laser with any 110v HeNe laser PS with the same/close output.(2400vdc @5.25A) and sell that one on ebay-- look at this: Melles Griot HeNe Gas Laser 05-LHP-121 w/ Power Supply - eBay (item 390111294415 end time Apr-25-10 16:46:03 PDT) for a comparison. Not that hard or expensive to come up with a 20-28 vdc 1.25A PS to power the PS-pita -but not much IMO. HeNe lasers are beautiful- I have that one(i think)--Hz btw --not all wallwarts are regulated and they rarely output exactly whats on the label - fyi.

The resistor is part of the housing/wiring. It is NOT part of the Alden.

I bought that exact item (same model, pic, everything) from the same seller (see my sig to take it apart ) and I bought this (see link below) to power the HeNe PSU and it works great. Outputs 24V 2.5A... that PSU requires 24V and 1.5A IIRC. All you have to do is cut off the part that plugs into laptop normally and this exposes a (+) and (-) lead. Hook it up to the HeNe PSU and you're good to go. 12.60 shipped!